L'Italia agricola odierna

New species of Calamoncosis Enderlein (Diptera: Chloropidae) from South Africa.

Three new and atypical species of Afrotropical Calamoncosis are described: Calamoncosis agricola sp. n. (type locality- South Africa: 15 km E Klaserie); Calamoncosis flavida sp. n. (type locality-South Africa: Roodewal); and Calamoncosis unicornis sp. n. (type locality-South Africa: 15 km E Klaserie). Calamoncosis unicornis exhibits extreme modification and sexual dimorphism in the antenna; in ...

بررسی سهم ایران در تحقیقات کشاورزی جهان سنجش کتابشناختی بانک‌های اطلاعاتی CAB, AGRIS, AGRICOLA از ابتدا تا سال 1997

Cinchona Root and Collar Rot in Peru and Bolivia^

*A contribution from the Estación Experimental Agricola en Tingo Maria, Peru, a technical agricultural service organization for the Oriente of Peru, operated jointly by the Dirección de Colonización y Asuntos Orientales, Ministry of Agriculture of Peru, and by the Ofläce of Foreign Agricultural Relations, U. S. Department of Agriculture. This study was made possible by funds provided through th...

An International Journal of Algal Research

ing and Indexing Services: The Journal is indexed by AGRICOLA, BIOSIS®, CAS, Current

The First Eigenvalue of Dirac and Laplace Operators on Surfaces

Let (M, g, σ) be a compact Riemannian surface equipped with a spin structure σ. For any metric ḡ onM , we denote by ΣḡM the spinor bundle associated to ḡ. We let ∆ḡ be the Laplace-Beltrami operator acting on smooth functions of M and Dḡ be the Dirac operator acting on smooth spinor fields with respect to the metric ḡ. We also denote by μ1(ḡ) (resp. λ1(ḡ)) the smallest positive eigenvalue of ∆ḡ ...